Fire in the Arctic Landscape Project Data - Conditions of Use

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1 ) Acceptable use. Use of the dataset will be restricted to academic, research, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.

2 ) Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.

3 ) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. The metadata for each dataset contains the recommended citation for the dataset.

4 ) Acknowledgement. The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example:

Data sets were provided by the MBL Fire in the Arctic Landscape Project. This material is based upon work supported by the National Science Foundation under Grants NSF-ARC-0856853 and NSF-ARC-0808789.

5 ) Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.

6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.

Disclaimer

While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

Arctic LTER Database

Conditions of Use

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.
2 ) Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.
3 ) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier. For example:

Shaver, G. 1989. Above ground biomass in acidic tussock tundra experimental site, 1989, Arctic LTER, Toolik, Alaska. Arctic LTER, Marine Biological Lab, Woods Hole, Ma 02543. 1989gsttbm http://ecosystems.mbl.edu/arc/terrest/biomass/index.shtml 

4 ) Acknowledgement. The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example:

Data sets were provided by the Arctic LTER. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493.

5 ) Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.
6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.

Disclaimer

While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

Dataset URLs:	METADATA: HTML, Rich Text, XML(EML compliant) DATA: Comma Delimited, Excel file with Metadata and data
Dataset ID:	2008_MCM_ARF14C.1
Dataset Title:	Burned soil surface radiocarbon values for moss macrofossils plucked from the Anaktuvuk River Fire sites
Investigator 1:
First Name:	Michelle
Last Name:	Mack
Organization:	University of Florida
Address line 2:	220 Bartram Hall
Address line 3:	Department of Biology
City:	Gainesville
State:	FL
Zip Code:	32611
Country:	USA
Investigator 2:
First Name:	Edward
Last Name:	Schuur
Organization:	University of Florida
Address line 2:	220 Bartram Hall
Address line 3:	Department of Biology
City:	Gainesville
State:	FL
Zip Code:	32611
Country:	USA
Associate Investigators:
Keywords:	Radiocarbon, soil organic layer, burned
Abstract:	We used radiocarbon dating of the organic soil surface remaining post-fire to examine whether the fire burned into ancient and likely irreplaceable soil C pools. Suprisingly, it did not; all radiocarbon dates from burned soil surfaces contained bomb carbon, setting the maximum age of the burned soil surfaces at ~50 years.
For questions about the Metadata and data contact the Investigators. For information about this web site contact:	Arctic LTER Information Manager The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole, MA 02543 Phone (508) 289 7496 Email: arc_im@mbl.edu Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File URL	http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10127&urlTail=burn/terrestrial/data/2008_MCM_ARF14C.csv
Data File Name	2008_MCM_ARF14C.xls
Beginning Date	6/25/2008
End Date	8/10/2008
Number of Data Records	27
Other Files to Reference	2008_MCM_ARFsites.xls; 2008_MCM_ARFloss.xls; 2008_MCM_ARFsoilCN.xls
Availability Status	1
Quality Control Information
Maintenance Description
Log of Changes:	Version 1: checked and generated EML and Web files. Jim L 12Jul2011
	Version 2: Updated to newer metadata form (with sites sheet). Fixed discrepency with variable names. Units updated to current standards. CH March 2013.

RESEARCH LOCATION:
Location Name	Anaktuvuk River Fire Scar	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One	Select Site or enter New One
Geographic Description	Anaktuvuk River Fire scar (2007)	Enter Description	Enter Description	Enter Description	Enter Description	Enter Description	Enter Description	Enter Description
Location Bounding Box
West Bounding Coordinate	-150.90848
East Bounding Coordinate	-150.19672
North Bounding Coordinate	69.34084
South Bounding Coordinate	68.94963
OR if single point location
Latitude	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Longitude	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees	In Decimal Degrees
Elevation	In Meters	In Meters	In Meters	In Meters	In Meters	In Meters	In Meters	In Meters
Link to Google Map

TAXONOMIC COVERAGE:
Organisms studied
Methods:	We used radiocarbon dating of the organic soil surface remaining post-fire to examine whether the fire burned into ancient and likely irreplaceable soil C pools. Because the moss and organic soil layer accumulates vertically through time, the radiocarbon values of the remaining organic matter can provide some indication of how long it took to accumulate the organic matter above it that was consumed during the fire. Two cores were selected from each of ten sites randomly selected from the 20 sampling sites and sliced into 1 cm depth increments. Moss macrofossils were removed from the top layer under a dissecting scope. Cellulose was extracted from the macrofossils45 and the sample was converted to graphite at 650?C with an iron catalyst in a hydrogen atmosphere46. Our primary standard for 14C analysis was NIST oxalic acid II (SRM 4990C, National Institute of Standards and Technology). For a secondary standard, we used IAEA-C6 sucrose standard (International Atomic Energy Agency, Vienna, Austria). Our blank was anthracite coal cleaned with a standard acid–base–acid treatment. All standards and blanks used for 14C measurements were combusted and purified similarly to the samples. The 14C content of the graphite was measured at the W. M Keck Carbon Cycle Accelerator Mass Spectrometry Laboratory at the University of California–Irvine.   Radiocarbon data are expressed as ? 14C, which is the per mil (‰) difference between the 14C/12C ratio of the sample and an international standard. Each sample was corrected for the effects of mass-dependent isotope fractionation of 14C values by correcting to a constant ?13C value of -25 ‰ and normalized to sample-specific measured ?13C values. ?13C was measured prior to graphitizing the CO2 at the University of Florida on a Delta XL isotope ratio mass spectrometer with a gas bench peripheral (Thermo Scientific, Waltham, MA), using a -10.46 ‰ PDB CO2 standard from Oztech (Stafford, Arizona, USA). In some circumstances, radiocarbon values during the bomb period (1950 to present) do not return unequivocal date estimates because of the shape of the atmospheric bomb curve (ref. 47). In a subset of those cases, we also analyzed the second, deeper 1 cm increment of organic soil for radiocarbon in order to determine the appropriate location of the surface date relative to the bomb peak. All samples had radiocarbon values above zero, so samples where the deeper segment was more enriched in radiocarbon then the surface segment were assigned to the ascending slope of the bomb peak (<1966), while samples where the deeper segment was more depleted than the surface segment were assigned to the descending slope (>1966).     Literature Cited 45Gaudinski, J. B., Dawson, T. E., Quideau, S., Schuur, E. A. G., Roden, J. S., Trumbore, S. E. et al., Comparative analysis of cellulose preparation techniques for use with C-13, C-14, and O-18 isotopic measurements. Analytical Chemistry 77 (22), 7212-7224 (2005). 46Vogel, J. S., Southon, J. R., and Nelson, D. E., Catalyst and binder effects in the use of filamentous graphite for AMS. Nuclear Instruments and Methods in Physics Research Section B-Beam Interactions with Materials and Atoms 29 (1-2), 50-56 (1987). 47Levin, I. and Hesshaimer, V., Radiocarbon - a unique tracer of global carbon cycle dynamics. Radiocarbon 42 (1), 69-80 (2000).

Data Table

Variable Name	Variable Description	Data Type	Units	DateTime Format	Code Information	Missing Value Code
State	Burned or unburned status of site	text
Site number	Number of the site	number	number			.=Missing or Not Measured
Field code	Code used to identify site in field notes	text
Profile number	Number of the replicate profile within the site	text
Depth	Depth increment of sample in cm (0=burned soil surface)	text
Lab sample number	Unique number assigned to each profile x depth sample in lab	text				.=Missing or Not Measured
AMS DEL 14C	DELTA 14C value in per mil corrected for radioactive decay and isotopic fractionation via 13C	number	dimensionless			.=Missing or Not Measured
AMS DEL 14C SE	Analytical standard error of the DEL 14C value	number	dimensionless			.=Missing or Not Measured
	Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.